Manchester United and Chelsea are reportedly very keen on the England man.
The striker has quickly become the star of the show at White Hart Lane, having enjoyed a breakthrough season last year with 31 goals in all competitions, and he has continued it this year having hit eight goals in 13 Premier League starts.
That has naturally led to interest in his services, with Chelsea and Manchester United in particular keen on him according to the Telegraph.
And with Tottenham set to move to a new stadium in future, a costly move for the club, Nicholas believes that could tempt them to sell.
“The interesting thing would be if Spurs had to look at the number and Harry knocked it back. That would be interesting,” he added.
One thing that will likely worry Tottenham fans about Kane is that they did eventually sell Gareth Bale despite being keen not to. That deal came down to money, with the huge sum offered by Real Madrid ultimately too good to turn down.
If Manchester United or Chelsea were to offer a similarly astronomical price for Kane, there is every chance Spurs could be tempted to sell in future.
They would surely be reluctant to deal with either side of those two sides though, with them not exactly enjoying friendly relationships with those clubs.